84639789 has 32 divisors (see below), whose sum is σ = 135663360. Its totient is φ = 51845184.

The previous prime is 84639767. The next prime is 84639791. The reversal of 84639789 is 98793648.

It is not a de Polignac number, because 84639789 - 2¹² = 84635693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84639749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102432 + ... + 103254.

It is an arithmetic number, because the mean of its divisors is an integer number (4239480).

Almost surely, 2^84639789 is an apocalyptic number.

It is an amenable number.

84639789 is a deficient number, since it is larger than the sum of its proper divisors (51023571).

84639789 is a wasteful number, since it uses less digits than its factorization.

84639789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1132 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 84639789 is about 9199.9885326015. The cubic root of 84639789 is about 439.0609950827.

The spelling of 84639789 in words is "eighty-four million, six hundred thirty-nine thousand, seven hundred eighty-nine".